By your logic, no point guard should make the league if they're not John Wall.

As for Lin, I've seen him a few times. He's got an all around game and may get onto a summer league team somewhere, but he'll have to work hard to make it. He's not exceptionally quick or athletic. He does decieve you and seems to have a hard work ethic and is motivated so who knows. Maybe he'll be a hidden gem the way Nash was (that's a big maybe though), or be like a George Hill type player.